-21+9=3(5-n)-4n

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Solution for -21+9=3(5-n)-4n equation: 



-21+9=3(5-n)-4n

We move all terms to the left:

-21+9-(3(5-n)-4n)=0

We add all the numbers together, and all the variables

-(3(-1n+5)-4n)-21+9=0

We add all the numbers together, and all the variables

-(3(-1n+5)-4n)-12=0



We calculate terms in parentheses: -(3(-1n+5)-4n), so:

3(-1n+5)-4n

We add all the numbers together, and all the variables

-4n+3(-1n+5)

We multiply parentheses

-4n-3n+15

We add all the numbers together, and all the variables

-7n+15

Back to the equation:

-(-7n+15)



We get rid of parentheses

7n-15-12=0

We add all the numbers together, and all the variables

7n-27=0

We move all terms containing n to the left, all other terms to the right

7n=27

n=27/7

n=3+6/7

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